Jack Black's festival helmet

Jack Black will wear a helmet when he performs at the Reading and Leeds music festivals.

The actor, who is set to appear on stage before legendary rockers Metallica, admits his band Tenacious D are prepared for the crowd to pelt them with bottles.

When asked if he was aware the crowd at Reading Festival are notorious for throwing bottles at acts, Jack replied: "Are you kidding me? Thanks for warning me. Well, I hope the crowd switch to throwing plastic bottles this year. I think I will bring my helmet!"

The Reading and Leeds music festivals are held over the weekend of August 22nd to 24th.

Meanwhile, Jack, who voices the character of Po the panda in new DreamWorks animation 'Kung Fu Panda', also revealed he still hasn't met Jackie Chan - even though the Kung Fu legend also lent his voice to the movie.

Jack said: "It was awesome that we had Jackie Chan in the movie. Unfortunately I never worked with him and I still haven't met him."